﻿// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Windows.Media;

using Nova.CodeDOM;
using ParameterModifier = Nova.CodeDOM.ParameterModifier;

namespace Nova.UI
{
    /// <summary>
    /// The view model for a <see cref="CodeDOM.ParameterRef"/>.
    /// </summary>
    public class ParameterRefVM : VariableRefVM
    {
        #region /* STATICS */

        internal static void AddViewModelMapping()
        {
            CreateViewModel.Add(typeof(ParameterRef),
                delegate(CodeObject codeObject, bool isDescription, Dictionary<CodeObject, CodeObjectVM> dictionary) { return new ParameterRefVM((ParameterRef)codeObject, dictionary); });
        }

        #endregion

        #region /* CONSTRUCTORS */

        /// <summary>
        /// Create a view model instance for the specified <see cref="CodeDOM.ParameterRef"/>.
        /// </summary>
        public ParameterRefVM(ParameterRef parameterRef, Dictionary<CodeObject, CodeObjectVM> dictionary)
            : base(parameterRef, dictionary)
        { }

        #endregion

        #region /* PROPERTIES */

        /// <summary>
        /// The underlying <see cref="CodeDOM.ParameterRef"/> model.
        /// </summary>
        public ParameterRef ParameterRef
        {
            get { return (ParameterRef)CodeObject; }
        }

        #endregion

        #region /* METHODS */

        #endregion

        #region /* RENDERING */

        protected override Brush RenderBrush(RenderFlags flags)
        {
            // This allows 'value' refs to be rendered as keywords
            if (ParameterRef.Reference is ParameterDecl)
                return ((ParameterDeclVM)CreateVM((ParameterDecl)ParameterRef.Reference)).RenderBrush();
            return IDENTIFIER_BRUSH;
        }

        public static void RenderParameterInfo(CodeRenderer renderer, ParameterInfo parameterInfo, RenderFlags flags, CodeObjectVM tag)
        {
            RenderFlags passFlags = flags & ~RenderFlags.Description;
            bool hasBorder = flags.HasFlag(RenderFlags.ForceBorder);
            if (hasBorder)
                renderer.CreateBorder(VariableDeclVM.StaticBorderBrush, VariableDeclVM.StaticBackgroundBrush, tag);

            AttributeVM.RenderAttributes(renderer, parameterInfo, tag);

            ParameterModifier modifier = ParameterRef.GetParameterModifier(parameterInfo);
            if (modifier != ParameterModifier.None)
            {
                renderer.RenderText(ParameterDecl.ParameterModifierToString(modifier), KEYWORD_BRUSH, tag);
                renderer.RenderText(" ", PUNC_BRUSH, tag);
            }

            Type parameterType = parameterInfo.ParameterType;
            if (parameterType.IsByRef)
            {
                // Dereference (remove the trailing '&') if it's a reference type
                parameterType = parameterType.GetElementType();
            }
            TypeRefBaseVM.RenderTypeAsTypeRefVM(renderer, parameterType, passFlags, tag);  // Render as TypeRefVM for nested tooltips
            renderer.RenderText(" ", PUNC_BRUSH, tag);
            renderer.RenderText(parameterInfo.Name, IDENTIFIER_BRUSH, tag);

            // If we have a border, return to the previous one
            if (hasBorder)
                renderer.ReturnToBorderParent(tag);
        }

        #endregion
    }
}
